In-Service Monitoring of Stator-Slot Magnetic Wedge Condition for Induction Motors

Stator-slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high-output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2016-07, Vol.52 (4), p.2900-2910
Main Authors: Sangwoo Han, Junyeong Jung, Kun Wang Lee, Sang Bin Lee, Nandi, Subhasis, Byunghwan Kim, Byunghee Kang
Format: Article
Language:English
Subjects:
Equivalent circuits
fault diagnosis
Glass
Inductance
Induction motors
Magnetic flux
Magnetomechanical effects
maintenance
Maintenance costs
Monitoring
Motors
Quality assessment
Risk
Rotors
Stator windings
Wedges
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Summary:Stator-slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high-output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly reported. Although missing wedges can deteriorate motor performance and reliability, there is currently no test method accepted in the field for wedge quality assessment other than offline, disassembled visual inspection. In this paper, a new in-service method for monitoring the magnetic wedge condition in induction motors based on the negative-sequence information is proposed. The new method is developed based on the analysis of the dynamic model of the induction motor with missing magnetic slot wedges, derived in this paper. The proposed method is verified on a finite-element (FE) model of a 6.6-kV, 1850-kW induction motor. It is also verified experimentally on a 6.6-kV, 220-kW induction motor operating in the field with missing wedges (before and after rewedging), and on a 380-V, 5.5-kW induction motor with custom-built, removable magnetic wedges. It is shown that the proposed method can provide online detection of missing magnetic wedges, which can help reduce maintenance costs and risk of degradation in motor performance.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2016.2539128